diff options
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/string.h | 3 | ||||
| -rw-r--r-- | arch/s390/lib/mem.S | 39 |
2 files changed, 41 insertions, 1 deletions
diff --git a/arch/s390/include/asm/string.h b/arch/s390/include/asm/string.h index 8662f5c..15a3c00 100644 --- a/arch/s390/include/asm/string.h +++ b/arch/s390/include/asm/string.h @@ -14,6 +14,7 @@ #define __HAVE_ARCH_MEMCHR /* inline & arch function */ #define __HAVE_ARCH_MEMCMP /* arch function */ #define __HAVE_ARCH_MEMCPY /* gcc builtin & arch function */ +#define __HAVE_ARCH_MEMMOVE /* gcc builtin & arch function */ #define __HAVE_ARCH_MEMSCAN /* inline & arch function */ #define __HAVE_ARCH_MEMSET /* gcc builtin & arch function */ #define __HAVE_ARCH_STRCAT /* inline & arch function */ @@ -32,6 +33,7 @@ extern int memcmp(const void *, const void *, size_t); extern void *memcpy(void *, const void *, size_t); extern void *memset(void *, int, size_t); +extern void *memmove(void *, const void *, size_t); extern int strcmp(const char *,const char *); extern size_t strlcat(char *, const char *, size_t); extern size_t strlcpy(char *, const char *, size_t); @@ -40,7 +42,6 @@ extern char *strncpy(char *, const char *, size_t); extern char *strrchr(const char *, int); extern char *strstr(const char *, const char *); -#undef __HAVE_ARCH_MEMMOVE #undef __HAVE_ARCH_STRCHR #undef __HAVE_ARCH_STRNCHR #undef __HAVE_ARCH_STRNCMP diff --git a/arch/s390/lib/mem.S b/arch/s390/lib/mem.S index be9fa65..7422a70 100644 --- a/arch/s390/lib/mem.S +++ b/arch/s390/lib/mem.S @@ -8,6 +8,45 @@ #include <asm/export.h> /* + * void *memmove(void *dest, const void *src, size_t n) + */ +ENTRY(memmove) + ltgr %r4,%r4 + lgr %r1,%r2 + bzr %r14 + clgr %r2,%r3 + jnh .Lmemmove_forward + la %r5,0(%r4,%r3) + clgr %r2,%r5 + jl .Lmemmove_reverse +.Lmemmove_forward: + aghi %r4,-1 + srlg %r0,%r4,8 + ltgr %r0,%r0 + jz .Lmemmove_rest +.Lmemmove_loop: + mvc 0(256,%r1),0(%r3) + la %r1,256(%r1) + la %r3,256(%r3) + brctg %r0,.Lmemmove_loop +.Lmemmove_rest: + larl %r5,.Lmemmove_mvc + ex %r4,0(%r5) + br %r14 +.Lmemmove_reverse: + aghi %r4,-1 +.Lmemmove_reverse_loop: + ic %r0,0(%r4,%r3) + stc %r0,0(%r4,%r1) + brctg %r4,.Lmemmove_reverse_loop + ic %r0,0(%r4,%r3) + stc %r0,0(%r4,%r1) + br %r14 +.Lmemmove_mvc: + mvc 0(1,%r1),0(%r3) +EXPORT_SYMBOL(memmove) + +/* * memset implementation * * This code corresponds to the C construct below. We do distinguish |
